离心机模型试验中制备砂样的砂雨沉积法
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摘要
在离心机试验中极其重要的一个步骤就是土样的制备,如何制备不同密实度土样是是模型试验中的关键问题。研制了一个砂雨法装置,可用于在离心机中制备目标砂样。通过一系列的标定试验研究得出了落砂高度、管径与砂土的相对密实度之间的关系。试验结果表面通过结合不同的管径和落砂高度,可利用落雨法装置制得不同级别的松砂或密砂。经过标定试验验证,该装置稳定可靠,制备的土样满足室内模型试验要求。
The sample preparation is one of the most important procedures in the centrifuge tests.The key issue is to prepare various samples with designated densities.This paper presents a new sample preparation method that can prepare sand samples with various densities by using the traveling pluviation apparatus(TPA)for the centrifuge tests.Throughout the calibration tests,the target density relationships among the dropping height of sand,diameter of the pipe are obtained.The calibration tests also indicate that this apparatus can provide various densities of the sand samples by adjusting the sand dropping height,and the diameter of sand pipe.
The sample preparation is one of the most important procedures in the centrifuge tests.The key issue is to prepare various samples with designated densities.This paper presents a new sample preparation method that can prepare sand samples with various densities by using the traveling pluviation apparatus(TPA)for the centrifuge tests.Throughout the calibration tests,the target density relationships among the dropping height of sand,diameter of the pipe are obtained.The calibration tests also indicate that this apparatus can provide various densities of the sand samples by adjusting the sand dropping height,and the diameter of sand pipe.
引文
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[2]杨俊杰,柳飞,丰泽康男,等.砂土地基承载力离心模型试验中的粒径效应研究[J].岩土工程学报,2007,29(4):477-483.
[3]柳飞.模型试验中地基材料粒径与基础尺寸效应研究[D].青岛:中国海洋大学,2013.
[4]曾虹静,王忠涛,罗强,等.自制砂土装样设备及其控制要素分析[J].人民长江,2012,43(11):66-70.
[5]Allard,M.A,A.G Hjortnas-Pedersen&J.G.Out,1994,Performance of a sand hopper,Centr ifuge94,C.F.Leung,F.H.Lee and T.S.Tan,Edi,A.A.Balkma,Rotterdam,Netherlands,pp.83-88.
[6]Fretti,C,D.C.F.Lo Presti&S.Pedroni,1995,A Pluvial Deposion Method to Reconsititute Well-Graded Sand Specimens[J].Geotechnical Testing Jurnal,GTJODJ,Vol.18,No.2,pp.292-298.
[7]Kuerbis,R&Y.P.Vaid,1988,Sand Sample Preparation The Slurry Deposition Method,Soils and Foundatiuns Japanese Society of Soil Mecha11icsand Foundation Engineering,Vol.28,No.4,pp.107-118.